From bab17cf143c4888d03eb51f20aa6b86210448608 Mon Sep 17 00:00:00 2001
From: Simon Glass <sjg@chromium.org>
Date: Sun, 29 Nov 2015 13:17:53 -0700
Subject: [PATCH] dm: pci: Add a function to read a PCI BAR
Add a driver-model function for reading the PCI BAR from a device.
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
---
drivers/pci/pci-uclass.c | 13 +++++++++++++
include/pci.h | 9 +++++++++
2 files changed, 22 insertions(+)
diff --git a/drivers/pci/pci-uclass.c b/drivers/pci/pci-uclass.c
index dea0cb6e06..7a886f2048 100644
--- a/drivers/pci/pci-uclass.c
+++ b/drivers/pci/pci-uclass.c
@@ -1055,6 +1055,19 @@ int pci_get_regions(struct udevice *dev, struct pci_region **iop,
return (*iop != NULL) + (*memp != NULL) + (*prefp != NULL);
}
+u32 dm_pci_read_bar32(struct udevice *dev, int barnum)
+{
+ u32 addr;
+ int bar;
+
+ bar = PCI_BASE_ADDRESS_0 + barnum * 4;
+ dm_pci_read_config32(dev, bar, &addr);
+ if (addr & PCI_BASE_ADDRESS_SPACE_IO)
+ return addr & PCI_BASE_ADDRESS_IO_MASK;
+ else
+ return addr & PCI_BASE_ADDRESS_MEM_MASK;
+}
+
UCLASS_DRIVER(pci) = {
.id = UCLASS_PCI,
.name = "pci",
diff --git a/include/pci.h b/include/pci.h
index 443af839b6..dcbe9787a3 100644
--- a/include/pci.h
+++ b/include/pci.h
@@ -1166,6 +1166,15 @@ struct udevice *pci_get_controller(struct udevice *dev);
int pci_get_regions(struct udevice *dev, struct pci_region **iop,
struct pci_region **memp, struct pci_region **prefp);
+/**
+ * dm_pci_read_bar32() - read a base address register from a device
+ *
+ * @dev: Device to check
+ * @barnum: Bar number to read (numbered from 0)
+ * @return: value of BAR
+ */
+u32 dm_pci_read_bar32(struct udevice *dev, int barnum);
+
/**
* dm_pci_find_device() - find a device by vendor/device ID
*
--
2.39.5